Exam Question
Describe TWO methods of tracing a subsurface crack in a machinery component. Explain with reasons which one of the two methods mentioned above is the most appropriate for detecting cracks in engine crankshafts.
Class 2 (2nd Engineer)
MEP
📅 Jul 2019
Reference Answer
(a) Two methods of tracing superficial cracks:
(i) Radiographic Testing
A non-destructive testing method that uses penetrating radiation (X-rays or gamma rays) to detect internal flaws in materials. The radiation passes through the material, and variations in its intensity are recorded on a X-ray film. Darker areas on the image correspond to denser regions (defects) within the material. X-ray radiography is better suited for smaller defects, while gamma radiography can penetrate thicker materials and detect larger flaws.
Advantages:
(i) Radiographic Testing
A non-destructive testing method that uses penetrating radiation (X-rays or gamma rays) to detect internal flaws in materials. The radiation passes through the material, and variations in its intensity are recorded on a X-ray film. Darker areas on the image correspond to denser regions (defects) within the material. X-ray radiography is better suited for smaller defects, while gamma radiography can penetrate thicker materials and detect larger flaws.
Advantages:
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